In the OSI model, which layer establishes and coordinates the communication dialogues between applications?
Session Layer
Transport Layer
Data Link Layer
Presentation Layer
The Session Layer (Layer 5) of the Open Systems Interconnection (OSI) model is responsible for establishing, managing, and terminating communication dialogues (sessions) between applications. This layer handles dialogue synchronization, checkpoint mechanisms, and conversation recovery. It manages communication between hosts by creating, maintaining, and ending connections between local and remote applications. Layer 5 functionality is especially important for applications requiring prolonged connections and those that need to track the state of a conversation between systems.
The Presentation Layer (Layer 6) handles data formatting, encryption, and compression. The Transport Layer (Layer 4) manages end-to-end connections and reliability, while the Network Layer (Layer 3) handles logical addressing and routing between different networks.
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